Validation of the Improved Limb Atmospheric Spectrometer-II (ILAS-II) Version 1.4 nitrous oxide and methane profiles
Artikel i vetenskaplig tidskrift, 2006

This study assesses polar stratospheric nitrous oxide (N(2)O) and methane (CH(4)) data from the Improved Limb Atmospheric Spectrometer-II (ILAS-II) on board the Advanced Earth Observing Satellite-II (ADEOS-II) retrieved by the Version 1.4 retrieval algorithm. The data were measured between January and October 2003. Vertical profiles of ILAS-II volume mixing ratio (VMR) data are compared with data from two balloon-borne instruments, the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS-B) and the MkIV instrument, as well as with two satellite sensors, the Odin Sub-Millimetre Radiometer (SMR) for N(2)O and the Halogen Occultation Experiment (HALOE) for CH(4). Relative percentage differences between the ILAS-II and balloon/satellite data and their median values are calculated in 10-ppbv-wide bins for N(2)O (from 0 to 400 ppbv) and in 0.05-ppmv-wide bins for CH(4) (from 0 to 2 ppmv) in order to assess systematic differences between the ILAS-II and balloon/satellite data. According to this study, the characteristics of the ILAS-II Version 1.4 N(2)O and CH(4) data differ between hemispheres. For ILAS-II N(2)O VMR larger than 250 ppbv, the ILAS-II N(2)O agrees with the balloon/SMR N(2)O within +/- 20% in both hemispheres. The ILAS-II N(2)O in the VMR range from 30-50 to 250 ppbv (corresponding to altitudes of similar to 17-30 km in the Northern Hemisphere (NH, mainly outside the polar vortex) and similar to 13-21 km in the Southern Hemisphere (SH, mainly inside the polar vortex) is smaller by similar to 10-30% than the balloon/SMR N(2)O. For ILAS-II N(2)O VMR smaller than 30 ppbv (>similar to 21 km) in the SH, the differences between the ILAS-II and SMR N(2)O are within +/- 10 ppbv. For ILAS-II CH(4) VMR larger than 1 ppmv ( similar to 30 km) and the ILAS-II CH(4) for its VMR smaller than 1 ppmv (>similar to 25 km) only in the NH, are abnormally small compared to the balloon/satellite data.

ADEOS

ILAS

Odin

SMR

Författare

M.K. Ejiri

National Institute for Environmental Studies of Japan

Utah State University

Y. Terao

Harvard University

T. Sugita

National Institute for Environmental Studies of Japan

H. Nakajima

National Institute for Environmental Studies of Japan

T. Yokota

National Institute for Environmental Studies of Japan

G. Toon

Jet Propulsion Laboratory, California Institute of Technology

B. Sen

Karlsruher Institut für Technologie (KIT)

G. Wetzel

Karlsruher Institut für Technologie (KIT)

H. Oelhaf

Karlsruher Institut für Technologie (KIT)

Joachim Urban

Chalmers, Institutionen för radio- och rymdvetenskap, Global miljömätteknik

Donal Murtagh

Chalmers, Institutionen för radio- och rymdvetenskap, Global miljömätteknik

H. Irie

Frontier Research Center for Global Change

N. Saitoh

University of Tokyo

National Institute for Environmental Studies of Japan

T. Tanaka

National Institute for Environmental Studies of Japan

H. Kanzawa

Nagoya University

M. Shiotani

Kyoto University

S. Aoki

Tohoku University

G. Hashida

National Institute of Polar Research

T. Machida

National Institute for Environmental Studies of Japan

T. Nakazawa

Tohoku University

H. Kobayashi

Central Research Institute of Electric Power Industry

Y. Sasano

National Institute for Environmental Studies of Japan

Journal of Geophysical Research

0148-0227 (ISSN)

Vol. 111

Ämneskategorier

Meteorologi och atmosfärforskning

DOI

10.1029/2005JD006449